GCN Circular 29457
Subject
GRB 210210A: Swift/UVOT Detection
Event
Date
2021-02-10T16:10:09Z (5 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and S. L. Laha (GSFC/UMBC/CRESST) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 210210A 85 s after the BAT trigger
(Laha et al., GCN Circ. 29444). A fading source consistent with the XRT position
(Goad et al. GCN Circ. 29448) is detected in the initial UVOT exposures, as also detected by Lipunov
et al. (GCN Circ. 29447) and de Ugarte Postigo et al. (GCN Circ. 29450).
The preliminary UVOT position is:
RA (J2000) = 17:31:05.01 = 262.77088 (deg.)
Dec (J2000) = +14:39:46.4 = 14.66290 (deg.)
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
Preliminary detections using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc.
1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 85 235 147 16.04 �� 0.03
white 878 1028 147 16.57 �� 0.06
v 629 648 20 16.95 �� 0.19
b 553 573 20 16.99 �� 0.11
u 298 547 246 15.91 �� 0.03
w1 679 699 19 16.05 �� 0.15
m2 827 847 19 16.13 �� 0.20
w2 779 798 20 16.35 �� 0.18
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of
E(B-V) = 0.097 in the direction of the burst (Schlegel et al. 1998).